Air-compressor.



V. OLSEN & F. SCHR ODER.

AIR COMPRESSOR.

APPLICATION mam JAN. 25, 1907.

941,646. Patented Nov. 30, 1909.

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AIR COMPRESSOR.

APPLIOATION rum) JAN. 25, 190').

- Patented Nov.30, 1909.

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AIR GOMPRESSQR.

APPLICATION FILED JAN. 25, 1901.

V. OLSEN & F. SGHRODER.

AIR COMPRESSOR.

APPLICATION FILED JAN. 25, 1901.

Patented Nov. 30, 1909.

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VIGGO OLSEN AND FRITZ SCHRODER, 0F BRIDGEPORT, CONNECTICUT.

AIR-COMPRESSOR.

Specification of Letters Patent.

Patented Nov. 30, 1909.

Application filed January 25, 1907. Serial No. 353,979.

To all :whom it may concerns Be it known that we, Vreco OLSEN and FRITZ SOHRODER, citizens of the United States, and residents of Bridgeport, in the county of Fairfield and State of Connecti cut, have invented certainnew and useful Improvements in Air-Compressors, ofwhich the following is a specification. Our invention relates to an improvement in air compressors, and it consists in certain details of construction to be more set forth in the following specification.

To enable others to understand our invention, reference is had to the accompanying drawings in which;

Figure lrepresents a sectional View of the casing and driving shaft on line a a:- of Fig. 3; Fig. 2 is a central sectional v1ew of the casing, cylinders and one of the pistons; Fig. 3- 1s a central sectional view of the casing and cylinders on line -b bof Fig. 2, and a broken view partly in section of the driving shaft; Fig. 4 is an e11- larged detail sectional view of the valve on line -03 d-of Fig. 5, and broken view of the air outlet pipe; Fig. 5 is an enlarged detail plan view of the valve and broken view of the air outlet pipe; 6 is an enlarged detail side elevation of the valve and broken view of the air outlet pipe.

The outer shell or casing is made in two parts 1 and 1*, as shown at Fig. 3. 2- is the driving shaft extending through the casing and eccentrically located with respect to the center of the casing as represented by the dotted line e, the dotted line f representing the center of the casing. The shaft is journaled in the sides of the said casing on the ball bearing 3-, and 4 is a ball bearing cage adapted to minimize the end friction of the mechanism within the casing. 5- and 6 are washers, and 7 and 8 screw rings mounted on a threaded portion of the shaft which Washers and rings, combined with shoulders on the shaft, will prevent end play thereof. 9- and -10 are caps secured to the casing, one of which caps covers the end of the shaft, and the other'embracing the same.

11, 12, 13 and 14- are cylinders, and 15 is a water jacket surrounding the cylinders and integral therewith. This water jacket has the side chambers 16- and 17 (Fig. 1) and the openings 18 2 and 3. The opposing (Fig. 2) surrounding the cylinders and communicating with the said side chambers. The cylinders are secured to the driving shaft and rotate therewith.

19, 2O, 21 and 22 are pistons mounted in the cylinders, and 23, 24, 25 and 26 are pins projecting transversely through the outer ends of the pistons and on which are mounted the rollers 27 28, 29 and 30 adapted to engage with the semi-circular ring -30 for the purpose to be hereafter 'more fully described. This semi-circular ring is located in the groove 31 of the inner wall of the casing by means of the screws 32 as seen more clearly at Figs. pistons are connected together by means of the side yokes 33, 34, 35 and 36, journaled respectively, on the projecting ends of the pins 23, 24, 25 and 26 and on each side of the pistons. This arrangement enables the pistons to move together in pairs so that, when one piston is moving toward the center of the compressor to force the air out of its cylinder under compression, the other or opposed piston is moving out to take air into its cylinder.

' At the bottom and in the side wall of each cylinder are the ports 37, 38, 39 and 40, whichports serve both as inlet and outlet air ports. 41 is the valve adapted to be held in close working relation with one side of the cylinder construction of the compressor so that, when the cylinders rotate, the joint between said cylinders and valve will remain air tight. The valve is held in position under spring tension as follows; 41 are ears projecting from the valve and having the holes 42- therethrough, as shown more clearly at Fig. 5. 43 (see also Figs. 3 and 6) are studs .whose outer threaded ends are adjustably located in threaded holes of the side 1* of casing. The inner ends of the studs enter freely the holes -42 of the ears 41 of the valve. Intermediate of the ends of the studs is the flange 43 and between this flange and the outer face of the valve is located the tension springs 44. By means of these adjustable studs and their springs, the valve is held in air tight Working relation with the cylinders. In the inner face of the valve is the long semi-circular port -45 which serves as the air inlet port, and 46 is a shorter .recess which serves as part of the outlet port et7+-, which port is located in the extension 41 of the valve and opens into the outlet or exhaust pipe 48'. This pipe extends through the casing '-l* and connects with the horizontal pipe &9, which latter pipe is made flexible to prevent strain or twist on the valve. This flexible pipe connects with the outside pipe 50-, as shown at Figs. 2 and 3, which outside pipe connects with the engine or other device, not shown, for receiving the compressed air.

The water is caused to circulate around the cylinders as follows: 51 (Fig. 3) is a chamber in the inner end of the driving shaft and extending far enough to communicate with the water jacket chamber -l6.

52 is a tube screwed into the bottom of this chamber and having the port 53 at its inner end to open into the water jacket chamber 16. The outer end of the tube 52-- is supported in the side cap 10, and -54 is a shorter tube secured to said cap with its inner end projecting within the larger tube 52, while its outer threaded end is adapted to be attached to a suitable water supply pipe, not shown. The incoming water passes through the tubes 5 l and -52 in the direction of arrows m and into the water jacket chamber through the port 53. After circulating around the cylinders, the water passes through the port 51* of the driving shaft and into the driving shaft chamber -51 as indicated by the arrows 1i,. From thence it passes into the chamber 56 of the cap 10, and from thence into the outlet pipe 57.

Operation. The valve 4l1 will, of course, remain stationary while the cylinders with their pistons rotate in the direction of arrow 0 Fig. 2. As shown in this view, the piston 19 is at its lowest point with the compressed air fully expelled from its cylinder -ll, While its opposing piston 21 is, by reason of the connecting yokes, at its extreme outward position with its roller 29 in contact with the ring 30 and at a point thereon where the slightest forward movement of the rotatable cylinders will cause the piston 21 to move inward and begin to compress the air in its cylinder. This inward movement of the piston -21 will cause a corresponding outward movement of the piston l9, and as soon as the port of the cylinder of the piston 19 reaches the long intake port 4L5 of the valve 4:1-, air will be drawn into said cylinder, which intake of air will continue until the cylinder has about reached the lower position, when the cylinder intake port will be shut off before compression begins to take place. From this lowest position, the compression will continue until the cylinder ports of the compression side of the device reaches the outias before mentioned, the movement of the let recess -46 when the air will begin to be forced out of the cylinder whose port is thus located. The port 4G- is sufliciently elongated to enable the compressed air in the cylinder to be completely exhausted therefrom before its port passes by said recess and the piston of said cylinder will have reached its lowest position as shown by the piston 19. The elongated port, 4i5 of the valve also gives the port of the cylinder in register therewith a long air intake under a high speed so that, sufiicientv air will have been drawn into the cylinder before said cylinder has reached its lowest oint.

One of the main features of our device is the perfect balance in which the pistons are always maintained and the centrifugal force counteracted under the greatest speed and with but little friction on the moving parts. 5 In compressors, where the pistons are oper ated in pairs, the opposing pistons are linked to a centrally located eccentric. This arrangement not only results in a material loss of power by reason of the frictional contact of these various moving parts, but the wear incidental to this friction soon renders the compressor unfit for service.

In our peculiarly constructed compressors piston is effected by contact of their rollers with the semi-circular ring -30-. This contact creates but little friction and is of such a nature that no perceptible wear is the result, and while one piston is compressing, the opposing piston is being moved out at the same time and with no additional power required or friction produced.

Having thus described our invention what we claim as new and desire to secure by Letters Patent is:

1. In an air compressor, a casing, a rotatable driving shaft journaled eccentrically therewith, a plurality of opposed cylinders having air ports and mounted thereon, pistons for said cylinders, yokes connecting each pair of opposed pistons, means for actuating said pistons, a non-rotatable valve embracing the shaft and registering with the vertical face of the cylinder construction, springs back of said valve, said valve having an elongated air inlet port with which the cylinder ports alternately register to draw air into the cylinder, and an oppositely located elongated air outlet recess and exhaust port, for the purpose set forth.

2. In an air compressor, a casing, a rotatable driving shaft journaled eccentrically therewith, a plurality of opposed cylinders having air ports and mounted thereon, pistons for said cylinders, yokes connecting each pair of opposed pistons, a non-rotatable valve embracing the shaft and registering with the vertical face of the cylinders, studs having threaded portions adjustably mounted in the casing, the rojecting ends of said studs supporting t e valve, springs to maintain the contact between said valve and cylinders, for the purpose set forth.

3. In an air compressor, a casing, a driving shaft, a plurality of piston carrying cylinders mounted thereon, a water jacket having chambers surrounding the cylinders, the shaft having a chamber in one end with an outlet port opening into the water jacket chambers, cap 10 secured to the casing and having discharge chamber 56 and an outlet port leading therefrom, water inlet tube 52 smaller than the shaft chamber and anchored in the end wall thereof and having an inlet port opening into the jacket chambers, said tube projecting outside the shaft chamber and through the cap chamber with its outer end anchored in the cap, smaller Water inlet tube 5% anchored in the cap and projecting within the tube 52, all arranged and combined so that water entering said tubes will pass into the jacket chambers and from thence to the shaft chamber and discharge in the cap chamber, set forth.

4. In an air compressor, the combination with an eccentrically rotatable driving shaft, a group of opposed cylinders and their pistons mounted thereon, of a casing inclosing said shaft and cylinders, said casing having a centrally located groove around its inner wall and located in the rotary path of the cylinders, a semi-circular ring secured in said groove, means on the pistons to engage the ring so that not less than two of the pistons will always be in contact with the ring, the end of said ring slightly tapered to form an easy entrance for the pistons, for the pur pose set forth.

Signed at Bridgeport in the county of Fairfield and State of Connecticut this 22d day of Jan. A. D. 1907.

VIGGO OLSEN. FRITZ SCHRODER.

for the purpose Witnesses:

GEO. D. PHILLIPS, Gno. W. FINN. 

